I'm just guessing but maybe expressions
The answer is 18 because 18 multiplied by 10 is 180
So maybe it’s 5, it’s equivalent to the side with 6, just shorter
X= -8/5y+16
y= -5/8x+10
you didnt say if the equation was "5x+8y=80" not sure if your adding or subtracting or adding but if your adding then this is correct :)
Answer:
x=9
Step-by-step explanation:3x-5+x=31
3x+x=31+5
4x=36
x=36/4
x=9